关键词: 准东五彩湾煤, 钠迁徙, 灰熔融温度, 低温共融物, 废弃硅粉

Abstract: The Zhundong Wucaiwan coal is blended with the waste silicon powder and combusted to study the ash fusion and sodium transformation characteristics of the coal. The experiment results show that, the sodium content of the ash increases substantially when the waste silicon powder is added to the coal. With the blending ratio of the waste silicon powder increasing, the sodium fixation rate rises accordingly. Meanwhile, the characteristic temperature of the ash tends to go up first and then down. The X-ray diffraction (XRD) and X-ray fluorescence (XRF) analyses indicate that the waste silicon powder causes the CaSO₄ in the Zhundong Wucaiwan coal to decompose at lower temperatures and produce a large amount of CaO which is apt to form eutectic hedenbergite. This is the major reason for the ash fusion temperature decrease. However, when the blending ratio reaches as much as 9%, crystobolite will become the dominant component and can act as the backbone of the ash, which leads to the increase of ash fusion temperature.

Key words: Zhundong Wucaiwan coal, sodium transformation, ash fusion temperature, low temperature eutectic, waste silicon powder